672053313640 has 16 divisors (see below), whose sum is σ = 1512119955780. Its totient is φ = 268821325440.

The previous prime is 672053313629. The next prime is 672053313661. The reversal of 672053313640 is 46313350276.

It can be written as a sum of positive squares in 2 ways, for example, as 631030051876 + 41023261764 = 794374^2 + 202542^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 16801332841 = 672053313640 / (6 + 7 + 2 + 0 + 5 + 3 + 3 + 1 + 3 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 672053313593 and 672053313602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8400666381 + ... + 8400666460.

Almost surely, 2^672053313640 is an apocalyptic number.

It is an amenable number.

672053313640 is an abundant number, since it is smaller than the sum of its proper divisors (840066642140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

672053313640 is a wasteful number, since it uses less digits than its factorization.

672053313640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16801332852 (or 16801332848 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 40.

The spelling of 672053313640 in words is "six hundred seventy-two billion, fifty-three million, three hundred thirteen thousand, six hundred forty".